kea-manage/cmd/root.go

/*
Copyright © 2024 Matthew Stobbs <matthew@stobbs.ca>
*/
package cmd

import (
	"errors"
	"log/slog"
	"os"
	"strconv"

	"git.staur.ca/stobbsm/kea-manage/ipv4/reservation"
	"git.staur.ca/stobbsm/kea-manage/lib/database"
	"git.staur.ca/stobbsm/kea-manage/lib/database/postgres"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"
)

// rootCmd represents the base command when called without any subcommands
var rootCmd = &cobra.Command{
	Use:   "kea-manage",
	Short: "Manage the isc-kea dhcp server",
	Long:  `Manage the isc-kea dhcp server backend in database.`,
	Run:   runMain,
}

// Execute adds all child commands to the root command and sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the rootCmd.
func Execute() {
	err := rootCmd.Execute()
	if err != nil {
		os.Exit(1)
	}
}

func init() {
}

// Manage kea dhcp host reservations in postgresql directly
// postgresql schema used from [https://gitlab.isc.org/isc-projects/kea/-/wikis/docs/editing-host-reservations]

// This will only work with hw-address identifiers. If I need support for more, I'll add it

func runMain(cmd *cobra.Command, args []string) {
	reslist := []*reservation.ReservationV4{}
	vlist := viper.Get("reservationV4").(map[string]any)

	for k, v := range vlist {
		v := v.([]any)
		ki, err := strconv.ParseInt(k, 10, 0)
		if err != nil {
			slog.Error("reservation", slog.Any("subnetid", err.Error()))
			continue
		}
		for _, vi := range v {
			vi := vi.(map[string]any)
			r := reservation.ReserveV4MacAddr(
				vi["identifier"].(string),
				vi["ipv4"].(string),
				vi["hostname"].(string),
				int(ki),
			)
			if !r.Validate() {
				slog.Error("reservation", slog.Any("validate", r))
				continue
			}

			reslist = append(
				reslist,
				r,
			)
		}
	}

	slog.Debug("reslist", slog.Any("slice", reslist))

	dbconf := viper.GetStringMapString("database")
	pg := postgres.Open(dbconf["host"], dbconf["port"], dbconf["user"], dbconf["password"], dbconf["name"])

	for _, v := range reslist {
		v := v
		if err := pg.InsertResV4(v); err != nil {
			if errors.As(err, &database.Exists) {
				if err := pg.UpdateResV4(v); err != nil {
					slog.Error("update", slog.Any("reservation", *v))
					continue
				}
				slog.Info("updated", slog.Any("hostname", v.Hostname))
			} else {
				slog.Error(err.Error())
			}
			continue
		}
		slog.Info("inserted", slog.Any("reservation", *v))
	}
}